CN107097858A - Body structure - Google Patents

Abstract

The invention provides a vehicle body structure. The left and right front bottom cross members (4) and the left and right rear bottom cross members (10) are connected to each other by a front connection frame (5) and a rear connection frame (11) straddling the tunnel portion (3B). The left and right underframes (12) are connected to the corresponding left and right front bottom cross members (4) and rear bottom cross members (10). The front floor cross member (4) and the rear floor cross member (10) have seat outer support portions (9) that support the outer lower ends of the left and right seats in the vehicle width direction. The front link frame (5) and the rear link frame (11) have seat inner support portions (6) that support the inner lower ends of the left and right seats in the vehicle width direction. Accordingly, with this vehicle body structure, not only can the left and right seats be assembled to the vehicle body with high precision, but also the deformation of the floor can be effectively suppressed when a collision load is applied from the vehicle body front-rear direction.

Description

Body structure

technical field

The invention relates to a vehicle body structure under a compartment.

Background technique

As a vehicle body structure under the passenger compartment, a structure is known in which a substantially rectangular bracket of an integral structure is connected to the floor and the left and right side members, and the left and right seats ( Refer to Patent Document 1).

In the vehicle body structure described in Patent Document 1, a bracket of an integral structure is arranged on the floor, and the bracket has a pair of front and rear cross member portions and a pair of left and right side member portions, wherein the front and rear pair of cross member portions are left and right. A pair of left and right side member parts extend in the vehicle body front-rear direction along the side members on the left and right sides in the vehicle width direction. Front and rear cross member portions of the bracket are joined to the upper surface of the floor panel, and left and right side member portions of the bracket are joined to vehicle width direction inner surfaces of the side members. Seat support portions that support the lower ends of left and right occupant seats are provided on each of the front and rear cross member portions.

[Patent Document 1] Japanese Utility Model Publication Publication No. 63-193987

In the vehicle body structure described in Patent Document 1, since the lower ends of the left and right seats are supported on the vehicle body by an integrally formed substantially rectangular bracket, the left and right seats can be assembled to the vehicle body with high precision. However, in the case of the vehicle body structure described in Patent Document 1, the front side cross member portion and the rear side cross member portion of the bracket are connected only by the side member portion on the outer side in the vehicle width direction. Therefore, when a collision load is applied from the longitudinal direction of the vehicle body, it is difficult to satisfactorily suppress the deformation of the floor panel by the bracket. Therefore, another floor reinforcement mechanism has to be added to the vehicle body structure described in Patent Document 1.

Contents of the invention

Therefore, the present invention provides a vehicle body structure that can not only assemble the left and right seats to the vehicle body with high precision, but also effectively suppress the deformation of the floor when a load is applied from the front and rear directions of the vehicle body.

In order to solve the above-mentioned problems, the vehicle body structure according to the present invention adopts the following structure.

That is, the vehicle body structure according to the present technical solution has a pair of left and right side sills (for example, the side sill 2 of the embodiment), a floor (for example, the floor 3 of the embodiment), and a pair of left and right front bottom cross members (for example, , the front bottom cross member 4 of the embodiment), the front connecting frame (for example, the front connecting frame 5 of the embodiment), a pair of left and right rear bottom cross members (for example, the rear bottom cross member 10 of the embodiment ), a rear connecting frame (for example, the rear connecting frame 11 of the embodiment) and a pair of left and right underframes (for example, the underframe 12 of the embodiment), wherein the pair of left and right side beams are roughly along the front and rear of the vehicle body The bottom plate is arranged below the left and right sides of the vehicle body; the floor has a bottom (for example, the bottom 3A of the embodiment) located on the left and right in the vehicle width direction, and a tunnel portion (for example, the channel portion 3B); the pair of left and right front bottom cross members are arranged on the upper surface of the bottom on the left side and on the top surface of the bottom on the right side approximately along the vehicle width direction, and their outer ends are aligned with the left and right sides. The respective corresponding side beams are connected; the front connecting frame spans above the channel part left and right and is connected with the left and right front bottom cross members; the left and right pair of rear bottom cross members are located The rear side of the front bottom cross member is arranged on the upper surface of the bottom on the left side and on the upper surface of the bottom on the right side substantially along the vehicle width direction, and its outer ends are respectively corresponding to the left and right sides. The side beams are connected; the rear connecting frame straddles the left and right above the tunnel part and is connected to the left and right rear bottom cross members; the pair of left and right underframes are generally arranged on the left side along the front and rear direction of the vehicle body On the upper surface of the bottom of the bottom and the upper surface of the bottom on the right side, the front side thereof is continuously formed with a pair of front side frames (for example, the front side frame 14 of the embodiment) at the front of the vehicle body. The front bottom cross member and the rear bottom cross members on the left and right have seat outer support portions (for example, the seat outer support portion 9 in the embodiment) for supporting a seat on which an occupant sits. The lower ends of the left and right seats on the outside in the vehicle width direction, the front connecting frame and the rear connecting frame have a seat inner support portion (for example, the seat inner support portion 6 of the embodiment), and the seat The inner support portion supports the lower ends of the left and right seats on the inside in the vehicle width direction, and the left chassis is connected to the left front bottom cross member and the left rear bottom cross member. , the bottom frame on the right side is connected to the front bottom cross member on the right side and the rear bottom cross member on the right side.

In the case of this vehicle body structure, the left and right front underbody cross members connected to each other by the front connecting frame and the rear bottom cross member connected to each other by the rear connecting frame are connected to a pair of right and left bottom cross members extending approximately in the vehicle front-rear direction. The underframe, therefore, the collision load in the front-rear direction of the vehicle body applied to the front side frames can be transmitted from the underframe to the left and right side sills via the left and right front underbody cross members and the left and right rear underfloor cross members. Therefore, it is difficult for the collision load in the front-rear direction of the vehicle body to be directly applied to the center region of the floor in the vehicle width direction. In addition, in this vehicle body structure, the lower ends of the left and right seats are supported on the front underbody cross member, the front link frame, the rear underfloor cross member, and the rear side link frame assembled integrally with high rigidity. , The left and right seats can be assembled to the vehicle body with high precision.

The body structure involved in this technical solution can also adopt the following structure:

There is a pair of left and right reinforcement plates (for example, the reinforcement plate 15 in the embodiment), which are arranged at the left and right corners of the upper surface of the tunnel portion substantially along the front-rear direction of the vehicle body, and have The upper wall (for example, the upper wall 15A of the embodiment) and the side wall (for example, the side wall 15B of the embodiment) where the upper surface and the side surface are joined have a cross-section substantially in the shape of a letter L, and the front connecting frame and the At least one of the rear connecting frames has a downward substantially Japanese katakana "U"-shaped opening on the vertical wall (for example, the vertical wall 5A of the embodiment) intersecting with the passage portion (for example, the embodiment of the vertical wall 5A). The opening 16) is disposed opposite to the upper surface and the left and right side surfaces of the channel portion, and the upper edge of the opening of the vertical wall has: an upper surface engaging flange (for example, an embodiment The upper surface engaging flange 5A-2), which is engaged with the upper surface of the upper wall of the reinforcing plate; the first arc portion (for example, the first arc portion 5A-3 of the embodiment), which is connected to The main body portion of the vertical wall (for example, the main body portion 5A-1 of the embodiment) and the upper surface joint flange, and the side edge of the opening portion of the vertical wall has a side surface joint flange (for example, The side surface engaging flange 5A-4 of the embodiment), which is engaged with the side surface of the side wall of the reinforcing plate; the second arc portion (for example, the second arc portion 5A-5 of the embodiment), It connects the main body portion of the vertical wall and the side surface joint flange, and the portion between the upper edge and the side edge of the opening portion of the vertical wall has a third arc portion (for example, , the third arc portion 5A-6 of the embodiment), the third arc portion connects the first arc portion and the second arc portion, and the radius of curvature is larger than the first arc portion and the The radius of curvature of the second arc portion.

In this case, in at least one of the vertical walls of the front side connecting frame and the rear side connecting frame, the upper surface joining flange of the upper edge of the opening part is joined to the upper wall of the reinforcement plate arranged at the corner of the tunnel part, In addition, in at least one of the vertical walls of the front connecting frame and the rear connecting frame, the side surface joining flange of the side edge of the opening is joined to the side wall of the reinforcing plate. Moreover, between the main body portion of the vertical wall and the upper surface joint flange and between the main body portion of the vertical wall and the side surface joint flange are respectively connected by a first arc portion and a second arc portion with a smaller radius of curvature. , can maintain high rigidity against bending or torsion. In addition, the first arc portion and the second arc portion are connected by a third arc portion having a larger curvature radius than the first arc portion and the second arc portion, so even if the first arc portion The radii of curvature of the center portion and the second arc portion are set to be small, and the third arc portion is hardly deteriorated during molding and the like. Therefore, by adopting this structure, the collision load applied from the front of the vehicle body through the tunnel portion can be effectively dispersed and applied to the front side floor cross member and the rear side floor cross member.

The body structure involved in this technical solution can also adopt the following structure:

The reinforcing plate disposed on the front side of the front connecting frame of the tunnel portion is made of a thin plate reinforcing plate made of high-strength steel plate, and the reinforcing plate disposed on the rear side of the front connecting frame of the tunnel portion The reinforcing plate is composed of a thick plate reinforcing plate made of a steel plate having a lower strength than the thin plate reinforcing plate and having a thickness greater than that of the thin plate reinforcing plate.

In this case, since the corners of the channel portion are reinforced by the thin plate reinforcing plate made of high-strength steel plate on the front side of the front connecting frame, the thin plate reinforcing plate can not only reduce weight but also improve load distribution performance. . In addition, on the rear side of the front connecting frame, the corners of the channel portion are reinforced by thick thick plate reinforcing plates made of low-strength steel plates. Therefore, the thick plate reinforcing plates can not only reduce product costs, but also Rigidity can also be maintained.

The body structure involved in this technical solution can also adopt the following structure:

The rear end portion of the chassis has an engaging flange (for example, the upper engaging flange 12A of the embodiment) that engages with a front wall (for example, the front wall 10A of the embodiment) of the rear bottom cross member, the The front wall of the rear bottom cross member has a bulging portion (for example, the bulging portion 17 in the embodiment) at a portion facing the rear end portion of the chassis, and the bulging portion has outwardly rearward sides on the left and right sides. An inclined inclined wall (for example, the inclined wall 17B of the embodiment) which is an engaging portion engaged with the engaging flange of the chassis.

In this case, the collision load applied from the front of the vehicle through the underframe can be efficiently transmitted to the front wall of the rear floor cross member through the inclined wall of the bulging portion of the rear floor cross member. In addition, since the joint flange at the rear end of the chassis is joined to the rear bottom cross member through the inclined wall, it is possible to avoid interference with the chassis by using a clip-type spot welding gun or the like during manufacture. Next, it is easy to carry out welding and fixing.

The body structure involved in this technical solution can also adopt the following structure:

There is a left and right pair of tunnel frames (for example, the tunnel frame 19 in the embodiment) and a reinforcement member in the tunnel (for example, the tunnel reinforcement member 20 in the embodiment), wherein the left and right pair of tunnel frames are roughly along the front-rear direction of the vehicle body Arranged at positions adjacent to the tunnel portion on the lower surfaces of the left and right bottom portions, the tunnel reinforcement member is disposed in the tunnel portion at a vehicle width facing the left and right front side underbody cross members. At the position of the inner extension line in the direction, the front connecting frame straddles above the channel portion left and right, and is joined to the corresponding front bottom cross members respectively above the left and right channel frames.

In this case, the inside of the tunnel portion in the vehicle width direction facing the left and right front bottom cross members is reinforced by reinforcement members in the tunnel, the left and right sides of the tunnel portion are reinforced by left and right tunnel frames, and the upper side of the tunnel portion is reinforced. Reinforced by the front side link straddling the tunnel left and right. Thereby, the inner side and the outer side of the channel part can be effectively reinforced, and deformation of the channel part in the opening direction and the closing direction can be suppressed. Therefore, by adopting this structure, it is possible to reduce the vibration of the bottom part when the vehicle is running.

The body structure involved in this technical solution can also adopt the following structure:

The left and right bottom portions have floor raised portions (for example, the floor raised portion 3A-1 of the embodiment) that are raised upward relative to the vehicle width direction outer regions at positions adjacent to the tunnel portion, so that The raised portion of the bottom plate is configured to be located at substantially the same height as the upper surface of the chassis, and the tunnel frame is arranged on the lower surface of the raised portion of the bottom plate.

In this case, a bottom plate raised portion at approximately the same height as the upper surface of the chassis is disposed adjacent to the tunnel portion, and the tunnel frame is disposed on the lower surface of the bottom plate raised portion. A sufficient sectional height of the vehicle width direction inner side region of the bottom cross member and the tunnel frame firmly hold the side portion of the tunnel portion. Therefore, the rigidity of the outer side of the tunnel portion in the vehicle width direction can be maintained high, and the vibration of the bottom portion when the vehicle is running can be effectively reduced. In addition, the raised portion of the floor and the upper surface of the chassis are located at substantially the same height, and the height of the lower surface of the channel frame disposed on the lower surface of the raised portion of the floor can be increased, so that the space below the channel frame can be used as a vehicle-mounted component. Efficient use of the layout space of components, etc.

The body structure involved in this technical solution can also adopt the following structure:

The underframe has grooves (for example, the groove 18 of the embodiment) or protrusions extending substantially in the front-rear direction of the vehicle body on the upper surface.

In this case, the rigidity of the chassis against bending and twisting can be improved by the grooves or protrusions provided on the upper surface of the chassis. Therefore, the collision load applied to the chassis by the front side frames can be more effectively transmitted to the side members.

The body structure involved in this technical solution can also adopt the following structure:

There is a pair of left and right outer underframes (for example, the outer underframe 22 of the embodiment), and the pair of left and right outer underframes are arranged at positions below the left and right underframes with the bottom interposed therebetween, and extending approximately in the front-rear direction of the vehicle body, the front parts of the left and right outer chassis are connected to the left and right front side frames, and the rear parts of the left and right outer chassis are connected to the left and right rear parts of the rear part of the vehicle body. Side frame connection.

In this case, the outer chassis frame connected to the front side frame at the front is connected to the rear side frame at the rear side, so that the collision load applied to the front side frame can be transmitted to the rear part of the vehicle body through the outer chassis frame. Rear side shelf. Therefore, by employing this structure, it is possible to further suppress deformation of the floor when a collision load is applied.

The body structure involved in this technical solution can also adopt the following structure:

The front link frame and the rear link frame have the seat inner support portion and mounting portions of vehicle components other than the seat (for example, the mounting portion 7 in the embodiment).

In this case, the front link bracket and the rear link bracket also serve as mounting portions for vehicle components other than the seat, so that the number of components such as brackets for mounting vehicle components can be reduced.

【Effect of invention】

According to the present invention, the left and right front bottom cross members connected to each other by the front connecting frame and the left and right rear bottom cross members connected to each other by the rear connecting frame are connected to a pair of left and right under frames extending approximately in the vehicle front-rear direction. , forming a rigid assembly, the front bottom cross member, the front connecting frame, the rear bottom cross member and the rear connecting frame on the assembly are supported with the lower ends of the left and right seats. Therefore, not only can the left and right seats be assembled to the vehicle body with high precision, but also the deformation of the floor when a collision load is applied from the front-rear direction of the vehicle body can be effectively suppressed by the highly rigid assembly.

Description of drawings

FIG. 1 is a plan view showing a frame portion under a cabin of a vehicle according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a frame portion under a cabin of a vehicle according to an embodiment of the present invention.

3 is a cross-sectional view of the vehicle according to the embodiment of the present invention, taken along line III-III in FIG. 1 .

4 is a cross-sectional view of the vehicle according to the embodiment of the present invention, taken along line IV-IV in FIG. 2 .

FIG. 5 is an enlarged view showing a portion indicated by V in FIG. 2 of a vehicle according to an embodiment of the present invention.

FIG. 6 is an enlarged view showing a portion indicated by VI in FIG. 2 of a vehicle according to an embodiment of the present invention.

Fig. 7 is a perspective view showing a state in which some components in Fig. 6 are removed.

8 is a cross-sectional view of the vehicle according to the embodiment of the present invention, taken along line VIII-VIII in FIG. 6 .

[Description of Reference Signs]

2: side beam; 3: floor; 3A: bottom; 3A-1: raised part of the floor; 3B: passage; 4: front bottom cross member; 5: front connecting frame; 5A: longitudinal wall; 5A-1: Main body; 5A-2: upper surface joint flange; 5A-3: first arc portion; 5A-4: side surface joint flange; 5A-5: second arc portion; 5A-6: third circle Arc; 6: Seat inner support; 7: Installation; 9: Seat outer support; 10: Rear bottom cross member; 10A: Front wall; 11: Rear connecting frame: 12: Underframe; 12A : upper joint flange (joint flange); 14: front side frame; 15: reinforcement plate; 15A: upper wall; 15B: side wall; 16: opening; Groove; 19: tunnel frame; 20: reinforcement components in the tunnel; 22: outer chassis of the compartment; 24: rear side frame.

detailed description

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a view of a frame portion below a cabin of a vehicle 1 according to the present embodiment as viewed from above, and FIG. 2 is a view of the frame portion as viewed from an upper left front portion side. 3 is a cross-sectional view taken along line III-III in FIG. 1 , and FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 2 .

In the vehicle 1 according to the present embodiment, side sills 2 extending substantially in the front-rear direction of the vehicle body are disposed below the left and right side portions of the vehicle. The inner surfaces in the vehicle width direction of the left and right side members 2 are joined to the left and right end portions of the floor panel 3 located below the vehicle compartment.

The floor panel 3 has a bottom portion 3A located on the right and left in the vehicle width direction and a tunnel portion 3B located substantially in the center in the vehicle width direction. The channel portion 3B protrudes upward by a predetermined height with respect to the left and right bottom portions 3A. The cross section of the tunnel portion 3B has a roughly Japanese katakana "コ" shape that opens toward the bottom of the vehicle body.

On the upper surface of the left bottom 3A and the right bottom 3A of the floor panel 3 , a front bottom cross member 4 extending substantially in the vehicle width direction is arranged. The cross-section of the front underbody cross member 4 has a downwardly open hat shape, and the outer ends in the vehicle width direction of the front underbody cross member 4 are joined to the corresponding left and right side sills 2 . An end portion of the front underbody cross member 4 located on the inner side in the vehicle width direction is joined to or arranged to face the outer side surface of the tunnel portion 3B.

Parts of the left and right front underbody cross members 4 on the inside in the vehicle width direction are connected to each other by a front connecting frame 5 arranged to span the left and right above the tunnel portion 3B. The front connecting frame 5 is formed in a box shape whose lower side is opened in the transverse direction and is in the longitudinal direction, and its lower edge parts are joined to the left and right front bottom cross members 4 and the tunnel part 3B. The left and right edge portions of the upper wall of the front connecting frame 5 are provided with seat inner support portions 6, and the seat inner support portions 6 support the left and right seats (not shown) for occupants in the vehicle width direction. inner lower end. The seat inner side support portion 6 refers to, for example, a support hole for fastening the lower end of the seat, a reinforcing portion thereof, a fastening member, and the like.

Furthermore, on the upper wall of the front side link frame 5, a mounting portion 7 is provided at a position on the inner side in the vehicle width direction than the seat inner support portion 6, and the mounting portion 7 is used for mounting a console box (console box). ) and other vehicle parts other than seats.

Box-shaped support stands 8 are protrudingly provided on portions of the upper walls of the left and right front floor cross members 4 on the outer sides in the vehicle width direction. On the upper wall of the support platform 8 is provided a seat outer support portion 9 that supports the lower ends of the left and right seats on which the occupants sit on the outer sides in the vehicle width direction. The seat outer support portion 9 refers to, for example, a support hole for fastening the lower end of the seat, a reinforcing portion thereof, a fastening member, and the like.

In addition, on the upper surface of the left bottom 3A and the upper surface of the right bottom 3A of the bottom plate 3, a rear bottom cross member 10 is disposed on the rear side of the front bottom cross member 4. And extend substantially along the vehicle width direction. Like the front underbody cross member 4 , the cross section of the rear underbody cross member 10 is also in the shape of a brim opening downward. join. An end portion of the rear floor cross member 10 located on the inner side in the vehicle width direction is joined to or arranged to face the outer side surface of the tunnel portion 3B.

Parts of the left and right rear underbody cross members 10 on the inner side in the vehicle width direction are connected to each other by a rear connecting frame 11 arranged to span the left and right above the tunnel portion 3B. Like the front connecting frame 5 , the rear connecting frame 11 is also formed in a box shape with a lower opening and a longitudinal direction, and its lower edges are joined to the left and right rear bottom cross members 10 and the tunnel portion 3B. Similar to the front link frame 5 , seat inner support portions 6 and mounting portions 7 for vehicle components other than the seat are provided on both left and right edge portions of the upper wall of the rear link frame 11 .

In addition, a box-shaped support platform 8 is protruded from the upper walls of the left and right rear bottom cross members 10 on the outer side in the vehicle width direction, and a seat outer support portion 9 is provided on the support platform 8 . The outer support portion 9 supports the lower ends of the left and right seats on which the occupants sit on the outer sides in the vehicle width direction.

The upper surface of the left bottom 3A and the upper surface of the right bottom 3A are joined to an underframe 12 extending substantially in the vehicle front-rear direction. The bottom frame 12 has a downwardly opened eaves hat shape in cross section, and the bottom frame 12 is arranged between the tunnel portion 3B and each of the left and right side beams 2 . The underframe 12 is engaged with the front floor cross member 4 while penetrating the lower edge of the front floor cross member 4 in the front-rear direction, and the rear end part is engaged with the front wall of the rear floor cross member 10 in a state of abutting against it. The rear bottom cross member 10 is engaged.

In addition, as shown in FIG. 3 , the front end portion of the underframe 12 is joined to a dashboard lower portion 13 which is a partition member located at the front of the vehicle compartment. The instrument panel lower portion 13 is sandwiched between the left and right underframes 12 , and a front side frame 14 is arranged on the front side of each of the left and right underframes 12 , and the front side frame 14 protrudes forward in the engine room. Therefore, the left and right underframes 12 are continuous with the left and right front side frames 14 located in the engine room in the front-rear direction via the dashboard lower portion 13 .

FIG. 5 is an enlarged view showing a portion indicated by V in FIG. 2 .

Metal reinforcing plates 15 are attached to left and right corners on the upper surface side of the tunnel portion 3B for reinforcing the corners. The reinforcing plate 15 has an upper wall 15A and a side wall 15B joined to the upper surface and the side surface of the channel portion 3B, respectively, and has a substantially L-shaped cross section. In addition, the reinforcing plate 15 disposed on the front side of the front connecting frame 5 and the reinforcing plate 15 disposed on the rear side of the front connecting frame 5 are different in material and thickness. Specifically, the reinforcing plate 15 arranged on the front side of the front connecting frame 5 is made of a thin plate reinforcing plate made of high-strength steel plate, and the reinforcing plate 15 arranged on the rear side of the front connecting frame 5 is made of a thick plate reinforcing plate. The thick plate reinforcing plate is made of a steel plate having a lower strength than the thin plate reinforcing plate, and a greater plate thickness than the thin plate reinforcing plate.

Here, as shown in FIG. 5 , the lower edge of the front side vertical wall 5A of the front connecting frame 5 is formed with a downward substantially Japanese katakana "U"-shaped opening 16, and the upper region of the channel part 3B ( part of the upper surface and the left and right side surfaces) are inserted into the opening 16 . On the upper edge of the opening 16 of the vertical wall 5A, an upper surface joint flange 5A-2 and a first arc portion 5A-3 are provided, wherein the upper surface joint flange 5A-2 and the upper surface of the channel portion 3B and the reinforcement The upper surface of the upper wall 15A of the plate 15 is joined; the first arc portion 5A- 3 is bent to the front side of the vertical wall 5A to connect the main body portion 5A- 1 of the vertical wall 5A and the upper surface joining flange 5A- 2 . In addition, a side surface joint flange 5A- 4 and a second arc portion 5A- 5 are provided on the side edge of the opening 16 of the vertical wall 5A, wherein the side surface joint flange 5A- 4 and the side wall of the reinforcing plate 15 The side surface of 15B is joined; the second arc portion 5A- 5 is bent toward the front side of the vertical wall 5A to connect the main body portion 5A- 1 of the vertical wall 5A and the side surface joint flange 5A- 4 . In addition, in the area between the upper edge and the side edge of the opening portion 16 of the vertical wall 5A, a third arc portion 5A- 6 is provided, which is bent along the curved portion of the reinforcing plate 15 to connect The first arc portion 5A- 3 and the second arc portion 5A- 5 are curved forward with a curvature radius larger than that of the first arc portion 5A- 3 and the second arc portion 5A- 5 .

The upper edge portion of the vertical wall 5A is welded and fixed to the upper surface of the channel portion 3B and the upper surface of the upper wall 15A of the reinforcing plate 15 at the upper surface joint flange 5A-2, and the side edge portion of the vertical wall 5A is fixed on the side surface. The joint flange 5A- 4 is welded and fixed to the outer side surface of the side wall 15B of the reinforcing plate 15 .

In addition, like the front vertical wall 5A, the rear vertical wall of the front connecting frame 5 is also welded and fixed to the channel portion 3B and the reinforcing plate 15 . In addition, the rear connection frame 11 may also adopt the same connection structure with the channel portion 3B as that of the front connection frame 5 .

FIG. 6 is an enlarged view showing a portion indicated by VI in FIG. 2 .

As shown in FIG. 6 , rear end portions of the left and right underframes 12 have upper joint flanges 12A (joint flanges) and side joint flanges 12B joined to the front wall 10A of the rear bottom cross member 10 . The upper joining flange 12A has a flat base wall 12A- 1 and a pair of joining pieces 12A- 2 slanting outward and rearward in the vehicle width direction from both left and right sides of the base wall 12A- 1 .

FIG. 7 is a diagram showing a state in which the chassis 12 in FIG. 6 is removed.

As shown in FIG. 7 , a bulging portion 17 bulging forward is provided at a portion of the front wall 10A of the rear bottom cross member 10 facing the rear end portion of each chassis 12 . The bulging portion 17 has a flat front wall 17A and a pair of inclined walls 17B, wherein the pair of inclined walls 17B are inclined toward the outer rear in the vehicle width direction from the left and right sides of the front wall 17A. The side joining flanges 12B at the rear end of each chassis 12 are welded and fixed on the front surface of the front wall 10A on the outer side of the bulge 17, and the left and right joining pieces 12A-2 of the upper joining flange 12A are welded and fixed. On the front surface of the inclined wall 17B of the corresponding bulging portion 17 .

In addition, the cross-section in the extending direction of each bottom frame 12 is in the shape of a brim hat opening downward, and as shown in FIG.

As shown in FIGS. 4 and 6 , grooves 18 extending approximately in the front-rear direction of the vehicle body are formed on the upper surface of each underframe 12 . Due to the arrangement of the groove 18, the rigidity of the upper wall of the chassis 12 is improved. In addition, although the groove 18 is formed on the upper surface of the chassis 12 in the present embodiment, instead of the groove 18 , a ridge extending substantially in the front-rear direction of the vehicle body may be provided.

In addition, as shown in FIG. 4 , a pair of left and right tunnel frames 19 extending substantially in the front-rear direction of the vehicle body are arranged at positions adjacent to the tunnel portion 3B on the lower surfaces of the left and right bottom portions 3A. The cross-section of each channel frame 19 is in the shape of a brim hat opening upwards, and each channel frame 19 is welded and fixed on the lower surface of the left and right corresponding bottoms 3A. In addition, a tunnel inner reinforcement member 20 is joined at a position facing the vehicle width direction inner extension line of the left and right front floor cross members 4 in the tunnel portion 3B. The reinforcement member 20 in the channel has a bulging shape part 20a which abuts on the inner surface of the channel part 3B, and this bulging shape part 20a can restrict the cross-sectional deformation of the channel part 3B in the inward direction.

The front connection frame 5 straddles above the tunnel portion 3B left and right, and is joined to the corresponding left and right front bottom cross members 4 above the left and right tunnel frames 19 .

In addition, the same tunnel interior reinforcement member as above is joined to the tunnel portion 3B at a position facing the vehicle width direction inner extension line of the left and right rear floor cross members 10 .

As shown in FIG. 4 , floor raised portions 3A- 1 are formed at positions adjacent to the tunnel portion 3B on the left and right bottom portions 3A, and the floor raised portions 3A- 1 are raised upward relative to the outer regions in the vehicle width direction. The floor raised portion 3A- 1 is formed at substantially the same height as the upper surface of the chassis 12 . Corresponding left and right channel frames 19 are welded and fixed to the lower surfaces of the respective left and right floor raised portions 3A- 1 . On-vehicle components 21 located on the outside of the vehicle are disposed at positions below the tunnel frames 19 straddling the left and right.

In addition, as shown in FIGS. 3 and 4 , a pair of left and right outer chassis frames 22 are welded and fixed to the lower surfaces of the left and right bottoms 3A in the outer regions in the vehicle width direction. The vehicle body extends in the fore-and-aft direction. The cross section of the outer chassis 22 is in the shape of a visor that opens upward. The left and right outer underframes 22 are arranged to face the respective left and right underframes 12 on the lower surface side of the bottom portion 3A, with the bottom portion 3A interposed therebetween. The front portions of the left and right outer chassis frames 22 are connected to the rear end portions of the corresponding left and right front side frames 14 . In addition, the rear portions of the left and right outer chassis frames 22 are connected to the left and right rear side frames 24 that support the rear side floor panels 23 at the rear side of the vehicle body. The rear side floor panel 23 is supported by the rear side frame 24 at a position higher than the front side floor panel 3 .

In addition, in FIGS. 1 and 2 , reference numeral 30 denotes a fuel tank disposed behind the floor 3 and partly swells below the floor 3 , and reference numeral 31 denotes a fuel tank connected to the rear side of the rear bottom cross member 10 . The tunnel portion 3B and the cross members of the left and right side sills 2 .

As described above, in the vehicle body structure of the vehicle 1 according to the present embodiment, the left and right front underbody cross members 4 are connected to each other by the front connecting frame 5, and the left and right rear underbody cross members 10 are connected by the rear connecting frame. 11 are connected to each other, and the left and right front underbody cross members 4 and the left and right rear underbody cross members 10 are connected to corresponding left and right underframes 12 extending approximately in the front-rear direction of the vehicle body. Therefore, when a collision load in the front-rear direction is applied to the front side frame 14 at the front of the vehicle body, the collision load is smoothly transmitted to the left and right sides by the left and right underframes 12 through the front bottom cross member 4 and the rear bottom cross member 10. The side beams 2. Therefore, in the vehicle body structure according to the present embodiment, the collision load in the front-rear direction is less likely to be directly applied to the floor panel 3 , and deformation of the floor panel 3 when a collision load is applied can be suppressed.

In addition, in the vehicle body structure according to the present embodiment, the left and right front floor cross members 4 connected to each other by the front connecting frame 5 and the left and right rear floor cross members 10 connected to each other by the rear connecting frame 11 are A pair of left and right underframes 12 extending in the front-rear direction of the vehicle body are connected to each other to form a highly rigid assembly. In addition, the lower ends of the left and right seats are supported by this rigid assembly. Therefore, when the vehicle body structure according to the present embodiment is adopted, the left and right seats can be assembled to the vehicle body with high precision.

In addition, in the vehicle body structure according to the present embodiment, the opening 16 is provided on the vertical wall 5A of the front link frame 5 , and the upper surface of the upper edge of the opening 16 joins the flange 5A- 2 and the tunnel portion 3B. The upper wall 15A of the reinforcing plate 15 at the corner portion of the opening portion 16 is engaged, and the side surface engaging flange 5A- 4 of the side edge of the opening portion 16 is engaged with the side wall 15B of the reinforcing plate 15 . Furthermore, between the main body portion 5A- 1 of the vertical wall 5A and the upper surface joint flange 5A- 2 , and between the main body portion 5A- 1 of the vertical wall 5A and the side surface joint flange 5A- 4 , the radius of curvature is small. The first arc portion 5A-3 and the second arc portion 5A-5 are connected. Therefore, the rigidity of the connection part between 5 A of vertical walls and the tunnel part 3B (reinforcing plate 15) can be maintained high.

Furthermore, in the vehicle body structure according to the present embodiment, between the first arc portion 5A- 3 and the second arc portion 5A- 5 of the vertical wall 5A passes through the first arc portion 5A- 3 and the second arc portion. The arc portion 5A- 5 is connected to the third arc portion 5A- 6 having a larger curvature radius than the arc portion 5A- 5 . Therefore, even if the radii of curvature of the first arc portion 5A- 3 and the second arc portion 5A- 5 are set small, the third arc portion 5A- 6 hardly deteriorates during molding or the like. Therefore, when the vehicle body structure according to the present embodiment is adopted, when a collision load is applied from the front of the vehicle body through the tunnel portion 3B, the collision load can be efficiently passed through the front floor cross member 4 or the rear floor cross member 4 . The members 10 are distributed to the left and right side members 2 .

In addition, in the vehicle body structure according to the present embodiment, the reinforcement plate 15 for reinforcing the tunnel portion arranged on the front side of the front side link frame 5 is composed of a thin plate reinforcement plate made of high-strength steel plate, and is arranged on the front side side link frame 5 . The reinforcing plate 15 for reinforcing the passage portion on the rear side is made of a steel plate whose strength is lower than that of the thin plate reinforcing plate, and is composed of a thick plate reinforcing plate having a thickness greater than that of the thin plate reinforcing plate. Therefore, in the case of adopting the vehicle body structure according to the present embodiment, the high-strength thin-plate reinforcing plate can be used on the front side of the front side link frame 5, which can not only reduce the weight, but also improve the load distribution performance. The rear side of the side connecting frame 5 is reinforced by a low-strength thick plate, which not only reduces product cost, but also maintains rigidity.

In addition, in the vehicle body structure according to this embodiment, the rear end portions of the left and right underframes 12 have an upper joint flange 12A and a side joint flange 12B joined to the front wall 10A of the rear floor cross member 10 , and the rear The front wall 10A of the side bottom cross member 10 has a bulged portion 17 at a portion facing the rear end portion of the chassis 12 . In addition, an inclined wall 17B inclined to the outside and rear is formed on the left and right sides of the bulging portion 17 , and the inclined engaging piece 12A- 2 of the upper engaging flange 12A of the bottom frame 12 is welded and fixed to the inclined wall of the bulging portion 17 . on 17B. Therefore, when a collision load is applied from the front of the vehicle body through the underframe 12, the collision load can be efficiently transmitted to the front wall 10A of the rear floor cross member 10 through the inclined wall 17B of the bulging portion 17 of the rear floor cross member 10. .

Furthermore, in the case of the vehicle body structure according to this embodiment, since the upper joint flange 12A of the rear end portion of the underframe 12 is joined to the rear bottom cross member 10 through the inclined wall 17B, it is possible to utilize The clip-type spot welding gun can be easily welded and fixed without interfering with the chassis 12 .

FIG. 8 is a view showing a state in which the rear end portion of the underframe 12 is welded to the front wall 10A of the rear bottom cross member 10 with a clip-type spot welding gun 32 .

As shown in FIG. 8 , in the case of the present embodiment, the welded portion of the rear portion of the chassis 12 and the rear bottom cross member 10 is inclined relative to the general portion of the front wall 10A of the rear bottom cross member 10 , thus making the point The curved welding arm 32a of the welding torch 32 easily straddles the flange portion 12C of the chassis 12 and the like. Therefore, the spot welding operation can be easily performed without causing the spot welding gun 32 to interfere with the chassis 12 .

In addition, in the vehicle body structure according to the present embodiment, a pair of left and right tunnel frames 19 are disposed on the lower surfaces of the left and right bottom portions 3A at positions adjacent to the tunnel portion 3B, and the left and right tunnel frames 19 in the tunnel portion 3B face each other. A tunnel inner reinforcement member 20 is arranged at a position on the inner side in the vehicle width direction of the front side bottom cross member 4 . Furthermore, the front connection frame 5 straddles above the tunnel portion 3B left and right, and is joined to the corresponding left and right front bottom cross members 4 above the left and right tunnel frames 19 . Therefore, when the vehicle body structure according to the present embodiment is adopted, the inner and outer sides of the tunnel portion 3B can be effectively reinforced to suppress deformation of the tunnel portion 3B in the opening direction or the closing direction. Therefore, it is possible to further reduce the vibration of the bottom portion when the vehicle is running.

In addition, in the vehicle body structure according to the present embodiment, a floor raised portion 3A- 1 having a height substantially equal to the height of the upper surface of the chassis 12 is arranged at a position adjacent to the tunnel portion 3B, and the floor raised portion 3A A channel frame 19 is arranged on the lower surface of -1. Therefore, the sufficient cross-sectional height H1 (see FIG. 4 ) of the vehicle width direction inner side of the front underbody cross member 4 and the tunnel frame 19 located therebelow can firmly hold the side of the tunnel portion 3B. Therefore, when the vehicle body structure according to the present embodiment is adopted, the rigidity of the tunnel portion 3B on the outer side in the vehicle width direction can be maintained high, and the vibration of the bottom portion when the vehicle is running can be more effectively reduced.

Furthermore, in the vehicle body structure according to the present embodiment, the floor raised portion 3A-1 is located at approximately the same height position as the upper surface of the underframe 12, and therefore, the floor raised portion 3A-1 can be arranged on the lower surface of the floor raised portion 3A-1. The height of the lower surface of the channel frame 19. Therefore, the space below the tunnel frame 19 can be effectively used as a space for arranging the in-vehicle components 21 and the like.

In addition, in the case of the vehicle body structure according to the present embodiment, grooves 18 extending approximately in the front-rear direction of the vehicle body are formed on the upper surfaces of the left and right underframes 12, so that the bending resistance of the underframe 12 can be effectively improved or Twisted Rigidity. Therefore, the collision load applied to the underframe 12 by the front side frame 14 can be more efficiently transmitted to the left and right side members 2 .

In addition, in the vehicle body structure according to the present embodiment, the outer underframe 22 is arranged on the lower surface of the outer regions in the vehicle width direction of the left and right bottom parts 3A, and the outer underframes 22 correspond to the left and right sides via the bottom part 3A. The underframes 12 face each other, the front portion of the outer underframe 22 is connected to the front side frame 14, and the rear portion of the outer underframe 22 is connected to the left and right rear side frames 24 at the rear of the vehicle body. Therefore, in the case of adopting this vehicle body structure, the collision load applied to the front side frame 14 can be smoothly transmitted to the rear side frame 24 at the rear of the vehicle body through the outer chassis frame 22, so as to more effectively restrain the collision load applied to the front side frame 14. Deformation of the floor panel 3 at the time of a collision load from the front of the vehicle body.

Furthermore, in the case of the vehicle body structure according to the present embodiment, not only the seat inner side support portion 6 but also in-vehicle components other than the seat are provided on the front side link frame 5 and the rear side link frame 11. Therefore, there is no need to additionally add brackets and the like for installing vehicle parts. Therefore, it is possible to reduce the number of parts and reduce the product cost.

In addition, this invention is not limited to the said embodiment, Various design changes are possible in the range which does not deviate from the summary.

Claims (9)

1. a kind of body structure, it is characterised in that the front side bottom of curb girder, bottom plate, pair of right and left with pair of right and left is horizontal Component, front side link, the bottom rear cross member of pair of right and left, the underframe of rear side link and pair of right and left, wherein,

The curb girder of pair of right and left is configured below the sidepiece of the left and right of vehicle body approximately along vehicle body fore-and-aft direction；

The bottom plate has the bottom for being located at overall width direction or so and the channel part protruded upward in overall width direction substantial middle；

The front side bottom cross member of pair of right and left is configured in the upper surface of the bottom in left side approximately along overall width direction On the upper surface of the bottom on right side, its outer end is connected with each self-corresponding curb girder in left and right；

Described front side link or so connects across the top in the channel part and with the front side bottom cross member of left and right Connect；

The bottom rear cross member of pair of right and left is located at the rear side of front side bottom cross member, approximately along overall width Direction configure left side the bottom upper surface and right side the bottom upper surface on, its outer end with left and right each The corresponding curb girder connection；

Described rear side link or so connects across the top in the channel part and with the bottom rear cross member of left and right Connect；

The underframe of pair of right and left is configured in the upper surface and right side of the bottom in left side approximately along vehicle body fore-and-aft direction On the upper surface of the bottom, a pair of front side frames of its toe lateral and body forward structure are continuous,

The front side bottom cross member of left and right and the bottom rear cross member of left and right have support on the outside of seat, Support is used to support the lower end on the outside of the overall width direction of the seat of the left and right for passenger riding on the outside of the seat,

There is support on the inside of support on the inside of seat, the seat to be used for branch for the front side link and the rear side link Lower end on the inside of the overall width direction for the seat for holding left and right,

The underframe in left side is connected to the horizontal structure of the bottom rear of front side bottom cross member and left side in left side Part,

The underframe on right side is connected to the horizontal structure of the bottom rear of front side bottom cross member and right side on right side Part.

2. body structure according to claim 1, it is characterised in that

Reinforcing plate with pair of right and left, the reinforcing plate is configured in the upper surface of the channel part approximately along vehicle body fore-and-aft direction Left and right corner, with the upper wall and side wall engaged respectively with the upper surface and side surface of the channel part, its section is substantially In alphabetical L-shaped,

At least one party in the front side link and the rear side link has on the longitudinal wall intersected with the channel part Downward is substantially in the opening portion of Japanese katakana U-shaped, the opening portion and the upper surface of the channel part and the side of left and right Surface is configured in opposite directions,

The upper limb of the opening portion of the longitudinal wall has：Upper surface joint flange, itself and the upper wall of the reinforcing plate Upper surface is engaged；1st arc sections, it connects the main part and the upper surface joint flange of the longitudinal wall,

The lateral margin of the opening portion of the longitudinal wall has：Side surface joint flange, itself and the side wall of the reinforcing plate Side surface is engaged；2nd arc sections, it connects the main part and the side surface joint flange of the longitudinal wall,

Position between the upper limb of the opening portion of the longitudinal wall and the lateral margin has the 3rd arc sections, described 3rd arc sections connect the 1st arc sections and the 2nd arc sections, and radius of curvature is more than the 1st arc sections and described the The radius of curvature of 2 arc sections.

3. body structure according to claim 2, it is characterised in that

The reinforcing plate configured in the front side link front side of the channel part is added by the thin plate of high-strength steel sheet Strong plate is constituted,

The reinforcing plate configured in the front side link rear side of the channel part is made up of slab reinforcing plate, the thickness Steel plate of the plate reinforcing plate by intensity less than the thin plate reinforcing plate is made, and thickness of slab is more than the thickness of slab of the thin plate reinforcing plate.

4. the body structure described in any one in claims 1 to 3, it is characterised in that

The rearward end of the underframe has the joint flange engaged with the antetheca of the bottom rear cross member,

The antetheca of the bottom rear cross member has bellying at the position opposite with the rearward end of the underframe,

The bellying has the inclined wall of back sweep laterally in left and right sides,

The inclined wall is the junction surface engaged with the joint flange of the underframe.

5. the body structure described in any one in Claims 1 to 4, it is characterised in that

Strengthening part in passage rack and passage with pair of right and left, wherein,

The passage rack of pair of right and left configures the lower surface and institute in the bottom of left and right approximately along vehicle body fore-and-aft direction State on channel part adjoining position,

The front side bottom cross member that faces left and right of the strengthening part configuration in the channel part in the passage On the inside of overall width direction on the position of extended line,

Described front side link or so across the top in the channel part, and left and right the passage rack top respectively with Each self-corresponding front side bottom cross member engagement in left and right.

6. body structure according to claim 5, it is characterised in that

The bottom of left and right has a heave portion, the heave portion with it is relative on the channel part adjoining position In overall width direction, exterior lateral area is swelled upward,

The heave portion is configured to, and is located at roughly the same height and position with the upper surface of the underframe,

The passage rack configuration is on the lower surface in the heave portion.

7. the body structure described in any one in claim 1~6, it is characterised in that

The underframe has the groove extended approximately along vehicle body fore-and-aft direction or ridge on an upper.

8. the body structure described in any one in claim 1~7, it is characterised in that

Outside underframe outside compartment with pair of right and left, the compartment of pair of right and left underframe configuration left and right the underframe every The lower position of the bottom, and is extended approximately along vehicle body fore-and-aft direction,

The front portion of underframe is connected with the front side frame of left and right outside the compartment of left and right, also, the compartment outer bottom of left and right The rear side connection of the rear portion of frame and the left and right of body tail.

9. the body structure described in any one in claim 1~8, it is characterised in that

The front side link and the rear side link have vehicle-mounted beyond support and the seat on the inside of the seat The installation portion of parts.